Inhalator



Feb. 26, 1952 F. P. PRIESTLY INHALATOR 3 Sheets-Sheet l Filed April 27,1949 INVENTOR. FRA/wf H P/Q/ISTLY 6 w /w s 4 Y Feb. 265, 1952 F. P.PRn-:sTLY

INHALATOR 3 Sheets-Sheet 2 Filed April 27, 1949 .ASSNG INVENTOR. P/e/S71.)

HMM/KP A@ ATTORNEY.

Feb. 26, 1952 v F, P PRlEs-{LY 2,587,215

- INHALATOR Filed April 27, 1949 's sheets-sheet s Patented Fel). 26,1952 UNITED= STATES PATENT OFFICE INHALATOR Frank P. Priestly, Chicago,Ill.

Application April 27, 1949, Serial No. 89,851 v (o1. 12s2o6 18 Claims.

This invention relates to devices for the diffusion and inhalation oftherapeutic powders and more particularly to such devices of suchsimplicity that they may be used in the home Without need for aphysicians presence or control.

It has recently been discovered that the inhalation of certaintherapeutic powders, principally penicillin and the like, into the`nasal and/or oral passages has a highly beneficial effect in thetreatment of certain diseases and infections. This is especially true inthe treatment of sinusitis and infections of the throat and lungs.

Previous treatment using this type of material has included a misttreatment which required complicated apparatus including compressedoxygen in tanks and the like to be found only in a physicians officeA orhospitals. Later devices for the use of the powder or dust, as it iscalled, included masks similar to a respirator mask covering both thenose and mouth and having a container therein for the powder. Thisdevice is not completely satisfactory because patients object to theheavy and unattractive device, and too much of the drug is lost duringinfhalation.

A simple method of inhaling the dust is not very successful becausepenicillin and other powders are highly hygroscopic and cake together ifthe normal breath is exhaled across them. A device has been proposedusing a small ball similar toV buckshct, which, upon inhalatiomstrikesthe capsule or cartridge holding thepowder to jar a few grains into thestream of air being inhaled. However, this device must be removed fromthe mouth or nose before exhaling to avoid contact of the moist breathwith the powder.

It is the purpose of my invention to provide an inhaler usable in thehome which does not require a special technique for the use thereof.This is accomplished by isolating the main supply of the powder from themixing or diffusion chamber and providing a means of transporting ameasured amount of the powder from the supply chamber to the mixingchamber. Furthermore, I provide a spring means which causes a jarringaction eachtime a new bit of the powder is carried to the mixingchamber. Moreover, my device is designed to use standard size capsules,which makes for a more economical use for -lling of medicament andisquite small so that it could be carried in a purse or pocket assimplyas a cigarette lighter or the like. My device is also quiteinexpensive since itcan be made from stock sizes and formsofmaterialgwithout special for# mation, requiring, therefore, only a minimum ofmachine Work to form my device.

Other advantages of my invention, and the invention itself, will becomeapparent from the following description which is illustrated by theaccompanying figures which form a part of this specification.

In the drawings:

Fig. 1 is an isometric View of one embodiment of my invention;

Fig. 2 is a top plan View of the push-button and slide mechanismdisassembled from the rest of my device;

Fig. 3 is a longitudinal medial section of this embodiment of myinvention showing the push button and slide in a retracted position;

Fig. 4 is a view similar to Fig. 3 showing the push button and slide inan inserted position;

Fig. 5 is a sectional view along line 5-5 of Fig. 3;

Fig. 6 is a sectional view along line 6-6 of Fig. 4;

Fig. 7 is a side elevational view of an alternative embodiment of myinvention;

Fig. 8 is a vertical medial section of this latter embodiment;

Fig. 9 is a, top plan view of the rotary slide means;

Fig. 10 is a bottom plan view of my alternative embodiment;

Fig. 11 is a side elevational view of the 'slide means; l

Fig. 12 is a perspective view of a second alternative embodiment;

Fig. 13 is a vertical medial section of `this second alternative;

Fig. 14 is a sectional view on line |4--I4 of Fig. 13;

Fig. 15 is a sectional view on line I5-.|5, of Fig. 14; and y Fig. 16isa vertical medial sectional view of a third alternative embodiment ofmy invention.

For the following description, reference is had to the figuresthroughout which like parts are designated by like reference characters.

Briefly, my invention comprises an inhaler composed of a body having twoseparate chambers, one for storing a supply of the powder to be inhaled,and` one inY Which a small amount of the powder is diffused in anairstream and from which it is led by a tube to the oral or nasalpassages into which it is inhaled. Sliding means is provided to -carrythe small, and measured, amounts of powder from the supply chamber tothe mixing chamber, and to isolate the two chambers from each other sothat whatever moisture gets into the mixing chamber from exhaled breathwill not get to the supply of powder.

More specically, my rst embodiment as shown in Figs. 1-6 inclusivecomprises a rectangular body I which may be made up of two pieces, anupper piece II and a lower piece I2, interlocked together as shown. Thematerial indicated in the gures is a plastic material, and while Iprefer to use a clear plastic for the body of my invention, theinvention is not limited to a device made of this material and mayassume4 other shapes than the rectangular.

The upper piece I I of the body contains a sup.- ply chamber I4 which isa cylindrical opening of a diameter such that a large size pharmacycapsule I5 will iit snugly therein. Near the bottom, the chamber -I4 isprovided with a shoulder I6 so that the capsule I5 will not be insertedintoV the opening beyond that point.

A slot I'! is provided between the upper and.

lower pieces, in which a slide member I8. is slidably disposed. Thisslide member as best shown in Fig. 2 is a flat rectangular piece ofcorrosion resistant metal such as Duralumin or stainless has a multiplefunction; it not only acts as a guide for the slide to avoid binding ofthe slide against the side walls, but also prevents over travel of theslide7 therefore locating the opening I9 in its proper position at bothends of travel of the slide. It serves a further purpose in that as theopening I 9 is slid from its pcsition beneath the capsule I5, it isbisected by the stop 2|', thus loosening the powder in the opening andcausing it to drop into the mixing chamber as hereinafter described. Asa stop, it also serves to convey the impact of a quick release of theslide to the capsule and the powder therein, causing the powder to beloosened and jarred into the opening I9 of the slide IB.

A novel spring arrangement is used which facilitates. the assembly ofthe device. The slide is formed with an opening comprising essentially alarge rectangular opening 22 having aY long tongue 23 and a shortertongue 24 extending into it. A compression spring 21 is then insertedinto the opening over the long tongue and compressed and allowed tospring over the shorter tongue. Thus the spring is completely held bythe slide member which, with the push button 28, forms a discretesub-assembly requiring no tools or spring holders to assemble into mydevice. Since the spring extends beyond the slide on the stop and bottomthereof. it is full-y effective to engage the two pieces II andv I2 andto urge the slide to, the left against the stop 2I as viewed in Figs. 3and 4.

The lower piece I2 of the body contains the mixing or diffusion chamber29 which is in the. form of a cylinder extending from one end 30 of thedevice. A circular opening 3I extends into the chamber 29 from the topof the piece I2 somewhat displaced from the supply chamber I4 andpreferably immediately below the stop 2I. I'he end opening of the mixingchamber may be provided with screw or taper threads the spring 2?.

not shown into which an inhaling tube 33 may be threaded. Grooves 34 arecut in the wall of the opening and, in the case of threads, intersectthe threads and extend beyond the end of the inhaling tube to allow airto enter the chamber and to become mixed with the powder. The air whichso enters is, subsequently in this description, called primary mixingair.

The tube 33, which is threaded into the mixing chamber 29, is formedwith a restriction 35 in the end thereof. This restriction causes a dropin pressure between the mixing chamber 29 and the interior of the tubewhen air is drawn therethrough. An opening 36 directly into the tubebetween the restriction 35 and the open end 31 of the tube is providedso that secondary mixing air will enter the stream at that point causingfurther turbulence in the air stream and better diiusion andpulverization of the powder than is possible with just the mixing whichtakes place in the chamber.

In use, the half capsule I5 filled with powder is inserted into thechamber I4, or the chamber I4 is lowered over the capsule to avoidspilling the powder. The device is then placed upright and the pushbutton 28 is pressed inward, sliding the slide IS inward so that theperiphery of the opening I9 engages the stop 2i compressing The slide isthen permitted to snap back against the stop jarring some of the. powderinto the `opening I9. Mot ing the slide in again carries the powder overthe opening 3 I into which it drcps being broken up somewhat by the step2I whih passes through the opening I9 as sho n in Fig. 6. This p;ocessmay be repeated, or the powder in the mixing chamber ma;7 now be inhaleddepending on the prescribed dosage.

To inhale the powder, the` open end 3l of the tube is placed in, thenostril or in the mouth and a deep breath is taken.. The air enteringthe oral or nasal cavities must be drawn through the grooves 34 and thelopening 36. The air entering the grooves stirs. up and mixes with thepowder in the chamber 29 diffusing it and carrying it into the tube.However, as previously explained, the restriction causes a pressure dropand secondary air enters through the opening 36 causing further mixing.is then conducted to the oral or nasal cavities through the tube.

Another embodiment of my invention, the operation of which is the same.though the details of construction are somewhat different, is shown inFigs. 7-11. In this embodiment, the body 40 is a single cylindricalpiece containing both the supply chamber 4I and the mixing chamber 42.The supply chamber 4I is formed the samey way as before with a shoulder43, although it may be somewhat deeper than that in the previouslydescribed embodiment. The method of attaching the tube 33 and itsformation, and the provisions. for primary and secondary mixing air areexactly the same. as in the previous. embodiment, except the tube may bebent as shown to account for the difference in orientation of the twodevices in use. The mixing chamber is similar, also, except that itextends completely through the body 40,..

The slide membery 44 of this` embodiment is` a rotary sliding device,journalled on a cylindrical' pivot member 45 extending from the bottom46 of the body 40. A spring washer 41 is used to urge this slide intoclose contact with the rbottom v'of' the body. kA plural-ity of' hollows48 are TheA diffused mixturev formed in the upper surface of the slidewhich are adapted to register with the mixing and supply chamber toreceive the powder and carry it from the supply chamber to the mixingchamber upon rotation of the slide. In order to provide a method ofjarring the powder down into the hollows 48, and to index the slide 44in its travel, a plurality of projections 49 is formed on the peripheryof the slide. Each of the projections comprises a sloping rise portionand an abrupt drop 01T 52 at the bottom of which there may be provided aslight notch 53 as a detent for better indexing of the hollows. A springmember 54 inthe form of a bent leaf spring is provided having aY finger55 to engage these projections. The spring 54 may be seated on the pivot45 and fastened thereto by a screw 56 threaded into the pivot. Anopening 51 in the spring may be provided to give access to the screw. Ascan be seen, the spring 54 serves additionally as a washer to hold thespring washer 41 in place.

The operation and use ofthe device is the same as previously describedexcept that instead of sliding the push button in and allowing it tosnap out, it is necessary with the latter device only to turn the slidemember 44 and allow the spring 54 to snap off the drop off 52 to jarloose the powder.

A second alternative form of my device is illustrated in Figs. 12-15. Inthis embodiment, the body is of cylindrical shape and is of the pushbutton slide type similar to the preferred embodiment. The body portion69 is of cylindrical shape having an enlarged end 6|. A bore 62 extendsthrough the body and is counterbored at 63 in the enlarged end 6| of thebody to receive the push button 64 of the slide member 65. In thisembodiment, I prefer to mount the spring 69 in the usual manner,engaging the bottom of an annular kerf 61 in the push button and thebottom of the bore 63 inthe bo dy. A longitudinal groove 93 is providedin the slide member which receives the end of a screw 69 threaded intothe body. This screw serves as a stop and guide for the slide membersimilar to the stop 2| of the rst embodiment. It is easily removable,and thus the inhalator may be readily disassembled for cleaning. v

The powder carrying parts of this embodiment are similar to the firstembodiment. The slide member 65 is shaped with a segmental portion 10 inextension from the push button 64 but preferably integral therewith.This portion is formed with an opening 1| and slot 12, similar to thosein the slide of the first embodiment. A tongue 13 extends into the slot12 to loosen the powder in a similar manner as in the first embodiment.In order to keep the powder in the opening, a partition 15 is providedhaving a horizontal wall 16 extending beneath the opening 1| when theslide is retracted. Directly over this wall 16 an opening 11 is formedfor the capsule l5 which may be inserted against a shoulder 18 asbefore. A reinforcing sleeve 19 may be formed or fixed to the body tosupport the capsule in this position.

As best shown in Figs. 14 and 15, thebody is formed with grooves 89 oneither side of the tongue 13 in which small extensions 32 are slidablydisposed. These grooves extend into the capsule opening 11, and theextensions are adapted to engage the capsule upon retraction of theslide to jar the powder from the capsule into the slide opening 1|.

The mixing chamber 84 is defined by the bore in the body and thepartition 15. This chamber e may be similar to that of the preferredembodiment or may be as illustrated. The chamber, as illustrated inFigs. 13 and 15, differs from the preferred embodiment only in that thetube is pressed into the end so that it may be more readily removed fordiscarding or sterilizing, and a few minor details are changed in anattempt to get more thorough mixture of air and powder. For instance,the only primary air opening 86 is at the bottom of the chamber so thatall the primary air sweeps over the powder in the bottom of the chamber,and the entrance of the tube extends into the chamber so that theprimary air will sweep more completely through the chamber. It will berealized that these changes are fully as applicable to my preferredembodiment as to this alternative form. A ridge 88 is also shown (Fig.13) around the tube 85 in order that the tube may be more firmly graspedfor insertion or withdrawal from the device and to prevent the userslips from stopping up the secondary air hole 36.

The operation of the last described device is in all respects similar tothat of my preferred embodiment.

Still another form of my invention is illustrated in Fig. 16. In thisembodiment, the mixing chamber 90 is formed in the inhaling tube 9|. Thebody portion 92 is a simple tube of circular cross section having asupply chamber 93 formed in one side. This may be similar to the supplychambers of the other embodiments. A push button slide member 94 isslidably disposed in one end of the body portion. This member may alsobe formed from a tube with one end closed by an end wall 95 preferablyhaving air inlet holes 96 therein for reasons to be explainedhereinafter. The powder carrying opening 91 is formed in the member 94and has a slot 98 similar to the slot 12 in the previously describedembodiment.

The tube 9| exteriorly of the body 92 has the same formation aspreviously described. However, in extension from the portion of tubesurrounding the restriction 99 therein, the tube is formed to providethe mixing chamber 90. This is formed by decreasing the diameter of thetube so that the slide member 94 will slide over it. The end is closedby an end wall |09 which may be of hernispherical shape as shown. A hole|03 may preferably be provided in this end wall to allow the passage ofthe primary mixing air directly into the chamber 9|).` At the top of thechamber an opening |94 is provided through which the powder may drop,and a tongue |95 is struck upward from this opening similarly to that inprevious embodiments.

The operation of `this device is the same as that of previous devices.The flow of the primary mixing air may be somewhat different, however,since it preferably comes in directly through the holes 96 in the pushbutton and the hole |03 in the mixing chamber. The powder is picked upby this air, carried through the restriction 99 then mixed morethoroughly by the action of the secondary mixing air and carried intothe passages as before.

Whereas in all the embodiments described, the slide member has been in aposition to receive the powder from the supply chamber when the pushbutton was retracted; still it will be apparent that this is notnecessarily so, and that the device could be readily rearranged toprovide that the push button be pushed in to load the lie-lattercaseg'theV inhaler could be thrown away L d `replaced when thesupply ofpowder was exai'isted. While V,[have dscribed'my invention in several'^\einb`diments"thereof, it will be realizedv that it is`not`li-initedthereto, and that numerous and "extensive departures may be` madetherefrom w'ithut "departing fi'om'the spirit or scope of invention. Iclaim:

An inhaler for 'therapeutic powder compris- H :ing abody, asupplychamber and a mixing cham- Fber -frmed in said body, a'slide operativebe- "-tween said supply chamber and said mixing chamber to' carry asmall 'amount of said powder 'from-saidsupply chamber to said mixingchamv'be'r, atube'connected into said mixing chamber andextendingoutwardly therefrom, and 4air pas- 'sages into said mixing Achamber forthe induction i of'air.

2.-'An inhaler `for therapeutic vpowder compris- 1 ing'abody, a supplychamber and a mixing chamfv-'ber formedinv said body, slide meansoperative `betweensaid-'supply chamber and said mixing chamber to carrysmall amount of said powder from said supply chamber to said mixingchamber, tube means connected into said mixing cham- A ber adapted uponinhaling to conduct said powder into theoral or nasal passages, saidslide means being adapted to'be snapped to jar said )gxwder-intc saidAslide means. Y

i 3'. An inhaler ier therapeutic powder comprising a body, a supplychamber and a mixing chaml"ber`fo`rmed in 'said body, slide meansoperative between saidsupply chamber and said mixing ."clianbe! tolcarry asinall amount of lSaid powder from" said supplychamber to saidmixing chamberjj tube'means connected into said mixing cham-'""beradapted 'upon inhaling to conduct said pow- ""de1""into' theoralor'nasal passages, said slide *"mean'sbeingadaptedto be snapped to jarsaid powder intrsaid slide means, vand air Ipassages formed beside saidtube means to conduct air *into* 4said mixing chamber.

4; VAAndn'halerfor therapeutic powder comlpr'i'sing a' bdy, a supplychamber and ya mixing 'cha'mber formed said body, slide means operaf"tive between saidsupply chamber and said mix- 'ingchamber tecarry asmall 'amunt of 'said powderirom-said supply chamber to said mixinglcliamber, tube means connected into-saidmixing "-'chamber-ada-pteduponinhaling to conduct said powder into the oral or nasal passages,vprimary mixingair passages `formed beside said tube to conduct air into*said mixing chamber and a secfondaryj mixingY air `opening in said tubeoutside nvof s'aidchamber. l f

fjiAn inhaler `I-for vtherapeutic powder comffprising abody, asupplychamber and a mixing i" `v`'cha-'rimer'formed i'n' said body,slide'means operahavingT A'the powder sealed in the chamber. vIn

1,; 8 i fftivf-'Utweeii-said suppiylgehamberfand saniy mixing-chamberlt'o-carry asmal-lamount f of said fpowrlerv vfrom saidl supply chambertosaidmixing f chamber, 'tube' means connected -into saidmixing 55chamber adaptedefor inhaling te conduct said 'powder -into the' oralor'- nasal passages, primary mixing airpassagesfrmed beside said tube toc'zonduct air intosaid mixingV chamber, a restrictio'n" iti-saidtube, asecondary-mixing air open- 105-ing said tube between'said'restrictionand the I fopen-end of 'said tube -for- -further mixing of? said yair?Tand'-V powder.

6An` inhaler-fior therapeutic'powder comprising a'bo'dy", a` supplychamber formed inf-said @bodyf slide @means slidably disposed insaidbody beneathsaid-fs'upply chamber, an opening in said lslide meansnormally in 'position beneath -said ""supply chamber, -ax'nixing chamberin saidbody i4"beneath fsaid* slidemeans, Y said 'pening f being"-'ada`pted tobe'slid by lthe .slide means -Viromiits normal position toa" position over said mixing 'i chamber tocarry a small amountof--saidpowder jth'ereto,- a tuber extending from-said v mixingHAchamber through which'the powder *maybe in- 7. Aninhaler*fortherapeutic powdercompris- 'ing a body, a supply chamberyformedin vsaid Abody adapted to receive a capsule of'said powder, a'slot'formed in said body beneath said supply chamber, slide `meanslslidably-disposed in said slot, an'lpening in said slide `-meansnormally in "position beneath said supply chamber, aL spring engagingsaid body andsaidslide means urging said slidemeans toward-its normalposition, stop i meansl yadapted to prevent movement ofV said slidemeans Yby said lspring beyond its normal position and tostop `saidslide'suddenly upon its Hrelease from any- 'position other than itsnormal 'position to' jar said powder and cause it to fall 4o into saidopening, a mixing chamber in said body beneath said slide means, saidopening adapted to be vslid bysaidy slide means from its normal positionto a position above said mixing chamber, Vfand tube means extending fromsaid' mixing 4tnlhlirgber thrugh which said powder maybe in- 8. Aninhaler for therapeuticpowder comprising a` body, a supply chamberformed insaid body, slide means slidably disposed in said body obeneatlrsaid supply chamber, an opening in said slide means normally in'vposition Vbeneath said supply'chamber, a mixing chamber insaid body-`"beheathisaid slide means, said openingbeing adapted to be slid "bythe slide means from its lnormalposition toa position over saidv mixingfchamberto carry a small amount of said powder "thereto,r a"'tube`extending from vsaid mixing 'y chamber through which the powderl may bein- "haled, and an air-'passage into said mixing cham- 6Ober tolallow.Aentry of the air thereinto to mix with said powder. An inhaler fortherapeutic powder `comprisrring a body,Y a supply chamber formedin'said "body, slide means slidablydisposed inv sai'db'ody beneath saidsupply chamber, an opening ir'i'said jslidenorrnallyfin position beneathsaid supply if -chamber, a mixing chamber'in said body beneath iYsaidslide means; said openingbeing adapted to flee slidy bythe 'slide'means from its nrmarp'osi- Ation'A to a-pbsilti niA over saidV mixing'chambery to carry 4a smallamount of saidl powder thereto, a vr`ll`tube'extending? from' said An'fiixing chamber through which the powder'lmaybe vinhaled, i primary Amixing'fair fpassageslfintcf *saidv` mixinglchamber,V` arestriction'` in said tube'andiisecodary mixing air passageinto said tube between said restriction and the open end of said tube toprovide further mixing of said air and said powder.

10. An inhaler for therapeutic powder comprising a body, a supplychamber and a mixing chamber formed in said body, slide means rotatablydisposed on said body beneath said chambers, hollows formed in saidslide means adapted to receive a small amount of powder from said supplychamber' and to carry it to said mixing chamber when said slide means isturned, and a tube extending from said mixing chamber through which saidpowder may be inhaled.

11. An inhaler for therapeutic powder comprising a cylindrical body, asupply chamber and a mixing chamber formed therein, slide meansrotatably disposed beneath said chambers, hollows formed in said slidemeans adapted to c-arry said powder from said supply chamber to saidmixing chamber, circumferential projections formed on said slide meanseach comprising a sloping rise portion and an abrupt drop off, springmeans fastened to said body having a finger engaging said projectionadapted to-in dex side slide means and to jar the powder from saidsupply chamber into said hollow upon reaching said drop off and a tubeextending from said mixing chamber through which the powder may beinhaled.

12. An inhaler for a therapeutic powder cornprising a body, a supplychamber formed in said body of such size that a capsule of said powdermay be smoothly inserted thereinto, a shoulder formed in said supplychamber to prevent insertion of said capsule beyond said shoulder, a

mixing chamber formed in said body, slide means rotatably disposed onsaid body beneath said chambers adapted to carry a certain amount ofsaid powder from said supply chamber to said mixing chamber, a tubeextending from said mixing chamber through which said powder may beinhaled.

13. An inhaler for a therapeutic powder comprising a body, a supplychamber and a mixing 'chamber formed in said body, slide means rotatablydisposed on said body beneath said chambers adapted to carry said powderfrom said supply chamber to said mixing chamber in small increments, atube extending into said mixing chamber through which said powder may beinhaled, primary mixing air passages extending into said mixing chamber,a restriction in said tube and secondary mixing air opening into saidtube between said restriction and the open end of said tube to allowadditional air to mix with said powder.

14. An inhaler for a therapeutic powder comprising a cylindrical body, asupply chamber and a mixing chamber formed in said body, a cylindricalpivot extending from the center of the bottom of said body, rotary slidemeans rotatably journalled on said pivot, hollows formed in said slidemeans adapted to carry said powder from said supply chamber to saidmixing chamber in small increments, peripheral projections on said slidemeans each comprising a sloping rise portion and an abrupt drop oi, aspring washer surrounding said pivot adapted to urge said slide meansinto contact with said body, spring means mounted on said pivot meanshaving a nger engaging said projections to index said slide means and tojar said powder from said supply chamber into said hollows upon snappingdown from said drop 01T, and tube means extending from said mixingchamber through which the powder may be inhaled.

15. Diffusion means for a therapeutic powder inhaler comprising a mixingchamber formed in said inhaler having an opening for the entry of thepowder and a tube opening, means in said inhaler adapted to close theopening for the entry of the powder after the powder is deposited insaid chamber, a tube inserted into said tube opening, through which saidpowder may be inhaled, primary mixing air passages opening into saidcham-ber cut into the walls of said tube opening, a restriction in saidtube and a secondary mixing air opening in said tube between saidrestriction and open end of said tube.

16. Diiusion means for a therapeutic powder inhaler comprising a mixingchamber formed in said inhaler having a tube opening, a tube insertedinto said tube opening and extending into said chamber through whichsaid powder may be inhaled, primary mixing air passages extending intosaid chamber, a restriction in said tube, and a secondary mixing airopening in said tube between said restriction and the open end of saidtube.

17. An inhaler for a therapeutic powder comprising a tubular bodyportion, a supply chamber formed in said body, slide means slidablydisposed in one end of said body, tube means at the other end of saidbody, a mixing chamber formed in said tube means extending into saidbody, said slide means being disposed thereabout, said mixing chamberbeing formed with a powder inlet opening at the top, longitudinallydisplaced from said supply chamber, said slide Vmeans having a powdercarrying opening normally disposed beneath said supply chamber andadapted to carry a small amount of powder from said supply chamber to aposition directly above said powder inlet opening, spring means engagedbetween said slide means of said tube means to urge said slide means toits normal position.

18. An inhalator for a medicament comprising enclosure means enclosing asupply chamber and a mixing chamber, movable means movably associatedwith said enclosure means adapted to carry a small amount of saidmedicament from said supply chamber to said mixing chamber, saidenclosure means being formed with outlet means from, and air inlet meansinto, said mixing chamber.

FRANK P. .PRIESTLY.

REFERENCES CITED The following references are of record in the Iile ofthis patent:

UNITED STATES PATENTS Number Name Date 576,437 Elliot Feb. 2, 1897795,676 Ammen July 25, 1905 923,837 Hautsch June 8, 1909 2,092,888MacCoul Sept. 14, 1937 2,200,076 Cooper May 7, 1940 2,259,759 LufkinOct. 21, 1941

